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应用晶界分离模型解释了片层α相的球化现象,阐述了TA15钛合金转变组织中次生片层α相的球化是其主要的流动软化机制.基于钛合金球化软化机理,建立了TA15钛合金的统一黏塑性本构模型.本构模型综合考虑了次生α相的球化、正则位错密度、等向硬化、塑性成形产生的温升、成形过程中的相变等物理变量.利用遗传算法确定了本构模型中的材料常数.本构模型能够较好地描述TA15钛合金热变形下的流动应力变化.
The phenomenon of spheroidization of αphase of the sheet was explained by the grain boundary separation model, and the spheroidization of the αphase of the secondary sheet in the transitional microstructure of TA15 titanium alloy was explained as the main flow softening mechanism.Based on the ball softening mechanism of titanium alloy, A unified visco-plastic constitutive model of TA15 titanium alloy is proposed.The constitutive model takes into account the spheroidization of secondary α phase, the density of regular dislocations, isotropic hardening, the temperature rise due to plastic forming, the phase transition during the forming process, etc. The material constants in the constitutive model were determined by using genetic algorithm.The constitutive model can well describe the change of flow stress under thermal deformation of TA15 titanium alloy.